Re: Quad 4 Closed Loop Question

No codes.


"Woody" <TheDuck@[EMAIL PROTECTED]
> wrote in message
news:cRrPj.40$LQ4.25@[EMAIL PROTECTED]
> Any codes showing up? As was mentioned check the coolant sensor. It can
be
> monitored on the OBDII tester.
>
> "Scott Buchanan" <t120rv@[EMAIL PROTECTED]
> wrote in message
> news:BeCdnZh4R99r9JDVnZ2dnUVZ_gydnZ2d@[EMAIL PROTECTED]
> > My car generally runs good. A problem is that sometimes, about a
minute
> > after a cold start, it will stumble for a few seconds. Usually I'll be
in
> > a
> > parking lot or in the driveway so it is not much of an issue. Last
week
it
> > happened after I pulled into traffic.
> >
> > A scan tool shows that it goes into closed loop about a minute after a
> > cold
> > start (40 deg F.). It cycles back to open loop then closed several
times
> > before it stays closed. This happened before the O2 sensor reached .5
> > volts.
> > I think that this might be a clue to the problem. Once running hot,
the
O2
> > sensor will cycle from rich to lean several times a second.
> >
> > My question is what allows the engine to go into closed loop?
> >
> > Thanks
> >
> >
>
>